/**
 * @author weism
 * copyright 2015 Qcplay All Rights Reserved.
 */

// des的辅助变量
var pc2bytes0 = new Array (0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204),
    pc2bytes1 = new Array (0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101),
    pc2bytes2 = new Array (0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808),
    pc2bytes3 = new Array (0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000),
    pc2bytes4 = new Array (0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010),
    pc2bytes5 = new Array (0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420),
    pc2bytes6 = new Array (0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002),
    pc2bytes7 = new Array (0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800),
    pc2bytes8 = new Array (0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002),
    pc2bytes9 = new Array (0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408),
    pc2bytes10 = new Array (0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020),
    pc2bytes11 = new Array (0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200),
    pc2bytes12 = new Array (0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010),
    pc2bytes13 = new Array (0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);
var spfunction1 = new Array(0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004);
var spfunction2 = new Array(-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);
var spfunction3 = new Array(0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
var spfunction4 = new Array(0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);
var spfunction5 = new Array(0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100);
var spfunction6 = new Array(0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010);
var spfunction7 = new Array(0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);
var spfunction8 = new Array(0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);    

/**
 * 加密算法
 */
qc.Des = {
    /**
     * 加密
     * @method qc.Des#encrypt
     * @param {string} key - 加密KEY。8位或64位字符串
     * @param {string} message - 待加密字符串
     */
    encrypt: function(key, message, mode, iv, padding) {
        return qc.Des._des(key, message, true, mode, iv, padding);
    },

    /**
     * 解密
     * @method qc.Des#encrypt
     * @param {string} key - 加密KEY。8位或64位字符串
     * @param {string} message - 待解密字符串
     */
    decrypt: function(key, message, mode, iv, padding) {
        return qc.Des._des(key, message, false, mode, iv, padding);
    },

    /**
     * 加密/解密字符串
     * @method qc.Des#_des
     * @private
     * @param {string} key - 加密/解密KEY。8位或64位字符串
     * @param {string} message - 待加密/解密字符串
     * @param {boolean} encrypt - true: encrypt; false: decrypt
     */
    _des: function(key, message, encrypt, mode, iv, padding) {
        // create the 16 or 48 subkeys we will need
        var keys = qc.Des.des_createKeys(key);
        var m = 0, i, j, temp, temp2, right1, right2, left, right, looping;
        var cbcleft, cbcleft2, cbcright, cbcright2
        var endloop, loopinc;
        var len = message.length;
        var chunk = 0;
        // set up the loops for single and triple des
        var iterations = keys.length == 32 ? 3 : 9; //single or triple des
        if (iterations == 3) { looping = encrypt ? new Array (0, 32, 2) : new Array (30, -2, -2); }
        else { looping = encrypt ? new Array (0, 32, 2, 62, 30, -2, 64, 96, 2) : new Array (94, 62, -2, 32, 64, 2, 30, -2, -2); }

        // pad the message depending on the padding parameter
        if (padding == 2) message += "        "; // pad the message with spaces
        else if (padding == 1) { temp = 8-(len%8); message += String.fromCharCode(temp,temp,temp,temp,temp,temp,temp,temp); if (temp==8) len+=8; } //PKCS7 padding
        else if (!padding) message += "\0\0\0\0\0\0\0\0"; // pad the message out with null bytes

        // store the result here
        var result = "";
        var tempresult = "";

        if (mode == 1) { //CBC mode
            cbcleft = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);
            cbcright = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);
            m=0;
        }

        // loop through each 64 bit chunk of the message
        while (m < len) {
            left = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16) | (message.charCodeAt(m++) << 8) | message.charCodeAt(m++);
            right = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16) | (message.charCodeAt(m++) << 8) | message.charCodeAt(m++);

            // for Cipher Block Chaining mode, xor the message with the previous result
            if (mode == 1) {
                if (encrypt) { left ^= cbcleft; right ^= cbcright; } 
                else { cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = left; cbcright = right; }
            }

            // first each 64 but chunk of the message must be permuted according to IP
            temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);
            temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16);
            temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2);
            temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
            temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);

            left = ((left << 1) | (left >>> 31)); 
            right = ((right << 1) | (right >>> 31)); 

            // do this either 1 or 3 times for each chunk of the message
            for (j=0; j<iterations; j+=3) {
                endloop = looping[j+1];
                loopinc = looping[j+2];
                // now go through and perform the encryption or decryption  
                for (i=looping[j]; i!=endloop; i+=loopinc) { //for efficiency
                    right1 = right ^ keys[i]; 
                    right2 = ((right >>> 4) | (right << 28)) ^ keys[i+1];
                    // the result is attained by passing these bytes through the S selection functions
                    temp = left;
                    left = right;
                    right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] | spfunction4[(right1 >>> 16) & 0x3f]
                        | spfunction6[(right1 >>>  8) & 0x3f] | spfunction8[right1 & 0x3f]
                        | spfunction1[(right2 >>> 24) & 0x3f] | spfunction3[(right2 >>> 16) & 0x3f]
                        | spfunction5[(right2 >>>  8) & 0x3f] | spfunction7[right2 & 0x3f]);
                }
                temp = left; left = right; right = temp; //unreverse left and right
            } //for either 1 or 3 iterations

            // move then each one bit to the right
            left = ((left >>> 1) | (left << 31)); 
            right = ((right >>> 1) | (right << 31)); 

            // now perform IP-1, which is IP in the opposite direction
            temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
            temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
            temp = ((right >>> 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2);
            temp = ((left >>> 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16);
            temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);

            // for Cipher Block Chaining mode, xor the message with the previous result
            if (mode == 1) {if (encrypt) {cbcleft = left; cbcright = right;} else {left ^= cbcleft2; right ^= cbcright2;}}
            tempresult += String.fromCharCode ((left>>>24), ((left>>>16) & 0xff), ((left>>>8) & 0xff), (left & 0xff), (right>>>24), ((right>>>16) & 0xff), ((right>>>8) & 0xff), (right & 0xff));

            chunk += 8;
            if (chunk == 512) { result += tempresult; tempresult = ""; chunk = 0; }
        } //for every 8 characters, or 64 bits in the message

        //return the result as an array
        return result + tempresult;
    },


    /**
     * 创建一个des的key值
     * @private
     */
    des_createKeys: function(key) {
        // declaring this locally speeds things up a bit

        // how many iterations (1 for des, 3 for triple des)
        var iterations = key.length > 8 ? 3 : 1; //changed by Paul 16/6/2007 to use Triple DES for 9+ byte keys
        // stores the return keys
        var keys = new Array (32 * iterations);
        // now define the left shifts which need to be done
        var shifts = new Array (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
        var lefttemp, righttemp, m=0, n=0, temp;

        for (var j=0; j<iterations; j++) { //either 1 or 3 iterations
            var left = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);
            var right = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);

            temp = ((left >>> 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4);
            temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);
            temp = ((left >>> 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp << 2);
            temp = ((right >>> -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16);
            temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);
            temp = ((right >>> 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8);
            temp = ((left >>> 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1);

            // the right side needs to be shifted and to get the last four bits of the left side
            temp = (left << 8) | ((right >>> 20) & 0x000000f0);
            // left needs to be put upside down
            left = (right << 24) | ((right << 8) & 0xff0000) | ((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0);
            right = temp;

            // now go through and perform these shifts on the left and right keys
            for (var i=0; i < shifts.length; i++) {
                // shift the keys either one or two bits to the left
                if (shifts[i]) {left = (left << 2) | (left >>> 26); right = (right << 2) | (right >>> 26);}
                else {left = (left << 1) | (left >>> 27); right = (right << 1) | (right >>> 27);}
                left &= -0xf; right &= -0xf;

                // now apply PC-2, in such a way that E is easier when encrypting or decrypting
                // this conversion will look like PC-2 except only the last 6 bits of each byte are used
                // rather than 48 consecutive bits and the order of lines will be according to 
                // how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7
                lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf]
                    | pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf]
                    | pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf]
                    | pc2bytes6[(left >>> 4) & 0xf];
                righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf]
                    | pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf]
                    | pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf]
                    | pc2bytes13[(right >>> 4) & 0xf];
                temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff; 
                keys[n++] = lefttemp ^ temp; keys[n++] = righttemp ^ (temp << 16);
            }
        } //for each iterations
        
        // return the keys we've created
        return keys;
    } 
};
